Valve stem for pneumatic tires



July 3, 1923.

' A. E3. SHAW VALVE STEM FOR PNEUMATICI TIRES Filed Ju ly 18 l@ PatentedJuly 3, 1923.

AI B. SHAW, OF MEDFOBD, MASSACHUSETTS, ASSIGNOR TO SHAW SPECIALTY CO.INC., OF BOSTON, MASSACHUSETTS, A CORPORATION F MASSACHUSETS.

VALVE STEM FOR PNEUMATIC TIRES.

Application tiled July 18, 1922. Serial No. 575,801.

To all whom it may concern:

Be it known that I, AI B. SHAW, a citizen of the United States ofAmerica, and a resident of Medford, in the county of Middlesex and Stateof Massachusetts, have invented certain new and useful Improvements inValve Stems for Pneumatic Tires, of which the following is aspecifica-tion.

This invention relates to valve stems for the pneumatic tires used onthe wheels of motor vehicles, and has for its object the production of adevice of this character havingia valve mechanism which will prevent leaage eifectually, and which is so constructed that it may beadjustedreadily into position to permit the inflation of the tire.

The invention consists of a valve stem having adjustably mounted on itsupper end a tubular member having a valve seat with which aspring-pressed valve coaets, said valve having a cone-shaped end whichis adapted to coact with a seat on the valve stem when the tubularmember has been adjusted inwardly of said valve stem.

The invention further consists in providing a ball and socket jointbetween the valve and its stem. v

The invention further consists of certain novel features of constructionand arrangement of parts which hwill be understood readily by referenceto the description of the drawings and to the claims to behereinaftergiven.

For the purpose of 'illustrating the invention, one preferred formthereof is shown in the drawlngs, thisform having been found to givesatisfactory and reliable results, although it is to be understood thatthe various instrumentalities of which the invention a0 consists can bevariously arranged and organized, and that the inventionis not limitedto the precise arrangement and organization A of the instrumentalitiesas herein shown and described, except as required by the scope of a5 theappended claims.

0f the drawings:

Figure 1 represents a plan of a valve stem embodying the principles ofthe present invention.

ea Figure 2 represents an elevation of the same.

Figure 3 represents a similar view with the upper end in section andshowing the parts adjusted into position for the use of the tire pump.

Figure 4 represents a View similar to Fig. 3. with the parts adjustedinto the position to close the passage in the valve stem after the tirehas been inilated, land Figure 5 represents an enlarged detail showingthe ball and socket connection between the valve and its actuating rod.

Similar characters indicate like parts throughout the several figures ofthe drawings. 4

In the drawings, 10 is a casing adapted to be attached to the inner tubeof a pneumatic tire in any well known manner.

The periphery of the casing 1() is preferably provided with a thread bywhich the usual dust cap or shield may be secured thereto.

1n the outer end oi the casing 10, there is formed a threaded chamber 11in which is adjustably mounted the tubular member 12. This tubularmember 12 has a pass-age 13 in its inner end in alinement lwith thepassage 14 extending through the casing 10. The member 12 is providedalso with a central chamber 15 of greater diameter than that of the`passage 13, and in alinement with this chamber 15 is a cylindricalrecess 16 in the outer end 'of the member 12, the diameter of saidrecess being greater than that of the chamber 15.

Extending through the tubular member 12 is a rod 17, having secured toits lower end a double-ended valve 18. This valve 18 has oppositelydisposed conical ends l19 and 20, the end 19 being adapted to coact withthe valve seat 21 on the inner end of the tubular member 12, while thecone-shaped end 20 is adapted to coact with the valve seat 22,surrounding the outer end of the passage 14.

lin forming Vthe passages through the casing 10 and the tubular member12;, these passages are sometimes liable to get out of alinement, and inorder to accommodate the device to all sorts of conditions, it isdesired 100 to have a pivotal connection between theinner end of the rod17 and the outer end of the double-ended valve 18.

In order to provide such a connection, the rod 17 has formed on itsouter end, a ball 105 23 which is positioned in a spherical socket 24formed in one end, 19, of the doubleended valve 18.

env

' manner to prevent the displabement ot the spider 27 thereon.

V/'hen it is desired to inate a tire, the tubular member 12 is movedinto the position indicated in Fig. 3 of the drawings,

this movement being accomplished by means oi a Spanner wrench actingupon the dat sides 29 formed by parallel grooves cut into the peripheryof the tubular member 12.

When the parts are in the position indicated in Fig. 3 ci the drawings,the spring acting against the spider 27 will torce j the conefshaped end19 of the valve member 18 to its seat 21, thereby preventing any escapeof air through the tubular member 12 during the operation of the vusualpump to initiate the tire. Under the pressure of said pump,the valve 18will be moved downward! ly to permit the passage of the air through saidtubular member 12 and the casing 10 into the inner tube.

Upon the stopping of the pump, the valve 18 will immediately be returnedto its seat by means of the spring 25. llhen the tire has been sucientlyindated, the tubular member 12 is turned by the Spanner wrench until itassumes the position indicated in Fig. 4 of the drawings, at which timethe cone-shaped end 20 is ili :n ly forced to its seat 22' and thecone-shaped end 19 is also firmly in contact with the seat 21 on thetubular member 12. 4

Under these circumstances, .it is absolutely impossible for any air to`escape from the tire through the passage 1d and the tubular member 12.@wing to the ball and socket connection of the valvev 18 with the rod17, said valve is adapted to accommodate itself to the valve seat 22even when it is not perpendicular to the axis of the member 12.

This makes a very convenient form of valve mechanism for initiatingtires, which is simple in construction and most edeotive in operation.

lt is believed that the operation and many neeaeoa able lengthwise ofsaid stem and having a valve seat in its inner end; a spring-pressed rodwithin said tubular member having a ball formed upon the inner end; anda double-ended valve having a socket to receive said ball.

3. A. valve stem having a valve seat in its upper end; a tubular memberadjustable lenwise of said stem and having a valve seat in its innerend; a ring-pressed rod within said tubular mem er having a ball stormedupon its inner end; and a valve having a socketto receive said ball andpro`1 vided with cone-shaped ends apted to coact with said valve seats.

d. A valve stem having a valve. seat in its upper end; a tubular memberthreaded to said upper end and provided on its inner end with a valveseat; a rod within said.- tubular member; a valve on the lower endetsaid rod; a spider on the upper end of -said rod;

and a spring coacting with said spider to force said valve to its seaton said tubular member.

5. A valve stem having a valve seat in its upper end; a member mountedin the upper end of said vstem provided with means for preventing theescape of air through said member during the pumping of the tire; andlmeans for so adjusting said member relatively to said stem as to preventescape of the air through said valve stem after the tire has beeninflated.

Signed by me at 74.6 01d South Bldg., Boston, Mass., this 17th day ofJuly, 1922.

Ar n'snaw.

Witnesses:

WALTER E. LOMBARD, NATHAN C. Loman.

